Greenpeace in Stockholm has started dumping boulders into the North Sea to prevent seabed trawling. The environmental group says it will deposit about 180 large granite rocks in the Kattegat sea area, some 12 miles off the western Swedish coast. Greenpeace objects to bottom trawling, which entails dragging a net along the seabed, saying it endangers the marine environment. It has urged Sweden to reform the EU's fisheries policy during its six-month presidency, which began last month. Eskil Erlandsson, the agriculture minister, said marine protection was already on the EU agenda. AP Stockholm